KR20080054537A - RDF Tag-based Location Recognition System - Google Patents

Abstract

The RFID tag-based location recognition system according to the present invention includes n RFID readers that transmit signals at a predetermined power level, and n tags that react differently according to the strength of a signal received from the RFID reader. Tag set, and each of the n tag sets responds 1: 1 to each signal as each signal transmitted from the n RFID readers is received, and information of each tag of each n tag sets according to the response is obtained. The RFID tag to be transmitted and the area managed by the n RFID readers are divided into a plurality of sectors, and a database in which information on the plurality of sectors is stored, and the RFID tag is compared through a comparison between the information received from the RFID tag and the database. It includes an operation management server that recognizes the sector where it is located.

As described above, the present invention receives the information of the reacted or unreacted tags from an RFID tag having a plurality of tag sets composed of a plurality of tags that react differently according to the strength of signals transmitted from the plurality of RFID readers. By determining the position of the position, it is possible to search for the position of the moving object in an enclosed space such as a room.

Description

RDF tag-based location recognition system {SYSTEM FOR SEARCHING A LOCATION BASED ON RFID TAG}

1 is a block diagram illustrating a RFID tag-based location recognition system according to an embodiment of the present invention.

2 is a diagram illustrating a tag set in an RFID tag applied to the present invention.

3 is a view showing a mobile body 1 and 2 having an RFID reader and an RFID tag for explaining the present invention.

4A to 4B are diagrams illustrating a tag set of an RFID tag in the mobile body of FIG. 3.

<Description of the code | symbol about the principal part of drawing>

100: RFID reader 100a: power level changing means

110: RFID Tag 120: Operations Management Server

120a: database

The present invention relates to a location recognition system, and more particularly, to a location recognition system based on an RFID tag.

Radio Frequency Identification (RFID) technology integrates the use of electromagnetic or electrostatic coupling within the radio frequency of the electromagnetic spectrum to identify objects, animals or humans. It does not require direct contact or scanning in the visible band. Due to the lack of an advantage, it is increasingly used in the industry as a technology to replace the barcode.

Meanwhile, with the recent development of wireless communication technology such as mobile communication, LBS is forming a large market in wireless Internet service. The location-based service combines location information of a moving user and a vehicle with various other information in real time to provide additional application services required by the user. Acquisition of location information is an important factor in providing an LBS service. Is one of.

Location information refers to a description of the actual terrain and the location of the object on the earth plane using a series of methods, generally using the Global Positioning System (GPS). GPS is a radio navigation system that uses satellites to measure the exact three-dimensional position, velocity, and time of time on the earth's surface.It receives a satellite signal from a satellite whose location is precisely determined by geometric trigonometry and measures the time it takes for radio waves to arrive. Calculate the position of. Recently, in a communication system such as CDMA or GSM, a network method for providing location information of a mobile terminal using an accurate location of a wireless repeater has been used. This provides the advantage of delivering location information to users inside the building.

However, such a location recognition method using GPS can be used only outdoors, and cannot be used to detect the location of a specific moving object indoors.

For this reason, many researches on location recognition using RFID technology have recently been made.

An object of the present invention is a result of the research based on the problems of the prior art, RFID tag having a plurality of tag set consisting of a plurality of tags that react differently according to the strength of the signal transmitted from a plurality of RFID reader The present invention provides an RFID tag-based location recognition system capable of searching for a location of a moving object in an enclosed space such as a room by receiving information of tags that have reacted or not reacting.

In order to achieve the above object, the present invention, n RFID reader for transmitting a signal at a predetermined power level, and n number of tags consisting of a plurality of tags that react differently depending on the strength of the signal received from the RFID reader A tag set, and each of the n tag sets responds 1: 1 to each of the signals as each signal transmitted from the n RFID readers is received, and according to the response, An RFID tag for transmitting information of each tag, a region managed by the n RFID readers, divided into a plurality of sectors, a database storing information on the plurality of sectors, and received from the RFID tag And an operation management server that recognizes the sector in which the RFID tag is located by comparing the information with the database.

Hereinafter, exemplary embodiments will be described in detail with reference to the accompanying drawings.

1 is a block diagram illustrating a RFID tag based location recognition system according to an exemplary embodiment of the present invention.

Referring to FIG. 1, an RFID tag-based location recognition system includes three RFID readers 100, an RFID tag 110, and an operation management server 120.

Each RFID reader 100 transmits a signal at a predetermined power level, and is connected to the operation management server 120 through a wired or wireless network. In addition, each RFID reader 100 is provided with a power level changing means 100a for adjusting the power level, it is possible to adjust the intensity of the signal transmitted by using the power level changing means 100a.

The RFID tag 110 includes three tag sets composed of a plurality of tags that react differently according to the strength of a signal received from each RFID reader 100 or a distance from each RFID reader 100, and the RFID reader As each signal transmitted from the 100 is received, three tag sets react 1: 1 with each signal.

That is, as illustrated in FIG. 2, the RFID tag 110 includes tag sets that respond to signals transmitted from R1, R2, and R3 of the RFID reader 100, and each tag set has a received signal. It consists of tags of T1, T2, T3, T4, T5, and T6 that react differently according to the intensity of the. Here, each tag reacts differently depending on the signal strength or the distance between the RFID reader 100 and the RFID tag 110.

As the RFID tag 110 receives signals from the three RFID readers 100, the RFID tag 110 provides the operation management server 120 with information of each tag that reacts or does not respond in each tag set.

The operation management server 120 divides the area managed by the RFID reader 100 of R1, R2, and R3 into a plurality of sectors, and includes a database 120a in which information on the plurality of sectors is stored. The sector received by the RFID tag is recognized through a comparison between the information received from 110 and the database 120A.

The database 120a of the operation management server 120 stores information of tags that have reacted or not reacted in each tag set for each sector of an area managed by the RFID reader 100 of R1, R2, and R3. As the power level of the signal transmitted from 100 changes, the information stored in the database 120a is updated.

Here, the operation management server 120 may be a device installed in a separate home or any electronic device having an RFID reader 100.

A process of recognizing the position of the RFID tag by the RFID tag-based position recognition system having the above configuration will be described with reference to FIGS. 3 to 4.

3 is a view showing a mobile body 1 and 2 having an RFID reader and an RFID tag for explaining the present invention, and FIGS. 4A to 4B are diagrams illustrating a tag set of an RFID tag in the mobile body of FIG. 3.

Referring to FIG. 3, the mobile body 1 (P1) having the RFID readers R1, R2, R3 and the RFID tag 110 is located in an area 300 managed by R1, R2, and R3.

First, when R1, R2, and R3, which are the RFID reader 100, transmit a signal having a predetermined power level, the moving object 1 P1 is transmitted by R1, R2, R3, which is the RFID reader 100, depending on the position. Will be received at different strengths.

That is, the mobile body 1 (P1) receives a signal having a greater signal strength from R2 which is closer than the other RFID reader 100, and receives a signal having a relatively small signal strength from R1.

Thus, as shown in Figure 4a, of the tag set in the RFID tag 110 of the moving object 1 (P1) tag set in response to the signal transmitted from the R1 RFID reader 100, only the tags of T4, T5, T6 reacts In the tag set responding to the signal transmitted from the R2 RFID reader 100, all tags except T1 (T2, T3, T4, T5, T6) will respond, and the R3 RFID reader 100 will be sent out. In the tag set that responds to the signal, the tags of T3, T4, T5, and T6 respond.

When the RFID tag 110 provides information on the reacted or unreacted tags of each tag set to the operation management server 120 through a wired or wireless network, the operation management server 120 provides the RFID tag 110 from the RFID tag 110. By extracting the matched sector information through comparison between the received tags in the tag set and the database 120a, the position of the mobile body 1 (P1) can be extracted.

Here, the area managed by R1, R2, and R3, which are the RFID reader 100, may adjust the strength of the signal transmitted through the power level changing means 100a in the RFID reader 100.

Meanwhile, the mobile body 2 (P2) receives signals transmitted from R1, R2, and R3, which are RFID readers 100, at different intensities according to their positions.

That is, the mobile body 2 (P2) receives a signal having a greater signal strength from R2 and R3 in close proximity than other RFID readers 100, and receives a signal having a relatively small signal strength from R1.

Therefore, as shown in FIG. 4B, only the tags of T4, T5, and T6 respond to the tag set responding to the signal transmitted from the R1 RFID reader 100 among the tag sets in the RFID tag 110 of the mobile body 2 (P2). In the tag set responding to the signal transmitted from the R2 and R3 RFID reader 100, all tags T3, T4, T5, and T6 except T1 and T2 react.

When the RFID tag 110 in the moving object 2 (P2) provides information on the tags that have been reacted or not to each tag set to the operations management server 120 through the wired / wireless network, the operations management server 120 generates the RFID. By extracting the corresponding sector information by comparing the information of the tags in each tag set provided from the tag 110 with the database 120a, the position of the mobile body 2 (P2) can be extracted.

According to the present invention, an RFID tag having a plurality of tag sets composed of a plurality of tags reacting differently according to the strength of signals transmitted from a plurality of RFID readers receives information of tags that have reacted or not reacted. You can search for a location.

The present invention is not limited to the above-described preferred embodiments, and various modifications can be made by those skilled in the art without departing from the gist of the invention as claimed in the claims. Such changes will fall within the scope of the claims.

As described above, the present invention receives information of tags that reacted or did not respond from an RFID tag having a plurality of tag sets composed of a plurality of tags that react differently according to the strength of signals transmitted from the plurality of RFID readers. By determining the position of the moving object, it is possible to easily search for the position of the moving object in an enclosed space such as a room.

Claims (5)

N RFID readers for transmitting signals at a predetermined power level, N tag sets including a plurality of tags that react differently according to the strength of signals received from the n RFID readers, and each n as each signal transmitted from the n RFID readers is received. An RFID tag that reacts 1: 1 to each of the signal sets, and transmits information on each tag of the n tag sets according to the response; A region managed by the n RFID readers is divided into a plurality of sectors, and has a database in which information about the plurality of sectors is stored, and the RFID tag is compared through the database received from the RFID tag. Operations management server that recognizes the sector where it is located RFID tag based location recognition system comprising a. The method of claim 1, The n number of RFID readers, And a power level changing means for changing a power level to adjust the strength of the transmitted signal. The method of claim 2, And the operation management server updates the information stored in the database as the strength of the signal is adjusted by the power level changing means. The method of claim 1, Each tag of each tag set reacts differently according to a distance between each of the n RFID readers and the RFID tag. The method of claim 1, The RFID tag, the RFID tag-based location recognition, characterized in that for transmitting the information about the tag of each tag of each tag set that does not respond to the signal transmitted from the RFID reader to the operations management server. system.

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